Solaris 10 10/09 Release Notes

x86: i86_mwait Work Does Not Function as Designed (6736444)

Systems with the Intel Xeon Processor MP 7400 series running the Solaris 10 10/09 OS might experience reduced performance and increased power consumption under light utilization. This problem might occur when CPUs do not quiesce, preventing power management while idle. No error message is displayed.

Workaround: Add the following line to the /etc/system file and reboot the system:

set idle_cpu_prefer_mwait=0